package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;
import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;

public class RefreshTokenInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.获取请求头中的token
        String token = request.getHeader("authorization");
        if (StrUtil.isBlank(token)){
            return true;
        }
        // 2.根据token从redis中获取用户
        Map<Object, Object> map = stringRedisTemplate.opsForHash().entries(LOGIN_USER_KEY + token);
        //将查询的数据转化为UserDTO
        UserDTO user = BeanUtil.fillBeanWithMap(map, new UserDTO(), false);
        if (user==null){
            return true;
        }
        UserHolder.saveUser(user);
        //刷新登录时间（token有效期）
        stringRedisTemplate.expire(LOGIN_USER_KEY+token,LOGIN_USER_TTL, TimeUnit.MINUTES);
        //4.放行
        return true;
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }
}
